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Table 5 Results from K-edge EXAFS fitting of Cu samples (see Figure 10 for corresponding EXAFS spectra and Fourier transforms)

From: Zn(II) and Cu(II) adsorption and retention onto iron oxyhydroxide nanoparticles: effects of particle aggregation and salinity

 

Cu-O

Cu-Fe 1

Cu-Fe 2

 

Aggregation condition

Sorption step

CN

R(Ã…)

CN

R(Ã…)

CN

R(Ã…)

r-factor

1.0 M

Adsorbed

4.3 ± 0.9

1.96 ± 0.02

1.3 ± 0.6

2.96 ± 0.04

0.8 ± 0.6

3.44 ± 0.07

0.0058

1.0 M

0.4 M Cl −

4.7 ± 1.0

1.97 ± 0.02

1.4 ± 0.6

2.97 ± 0.04

1.3 ± 0.6

3.44 ± 0.05

0.0059

75°C

Adsorbed

4.4 ± 1.0

1.95 ± 0.02

1.4 ± 0.6

2.94 ± 0.04

1.3 ± 0.7

3.43 ± 0.05

0.0059

75°C

0.4 M Cl −

4.7 ± 1.0

1.97 ± 0.02

1.9 ± 0.6

2.99 ± 0.03

1.3 ± 0.6

3.48 ± 0.05

0.0052

pH 10

Adsorbed

4.5 ± 0.9

1.96 ± 0.02

1.3 ± 0.5

2.95 ± 0.03

0.9 ± 0.4

3.44 ± 0.06

0.0052

pH 10

0.4 M Cl −

3.6 ± 0.6

1.97 ± 0.01

1.5 ± 0.3

2.99 ± 0.02

0.9 ± 0.3

3.46 ± 0.04

0.0035

  1. Included are coordination numbers (CN), interatomic distances (R), and goodness of fit values (R-factor). Debye-Waller values were allowed to float for first-shell fits (average: 0.004 Å2) and were fixed at 0.01 Å2 for subsequent shells.
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Geochemical Transactions

ISSN: 1467-4866

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